It's a proprietary container interface that - as far as I could tell - runs on the outdated and unsupported "docker machine"[1]. An alternative would be to run a more recent container runtime of your choosing in a VM through UTM which works beautifully.
I did intentionally delay the update from 23.x to 24.x by a few weeks while I waited for things to settle, because last time I updated from 22.x to 23.x shortly after release and some users were hit by bugs that hadn't been ironed out yet.
Edit: Noticed that you edited your comment to say that it uses "Docker Machine" instead. That's not the case. OrbStack uses a nested architecture where it runs Linux machines [1]. There's a special machine called "docker" that runs a copy of the Docker Engine, but that's not related to the old Docker Machine project.
My confusion must have come from mixed terminology being used by others than yourself on GitHub and in articles about your project I skimmed through when looking into it.
The project might still not be for me regardless of its underpinning, although I will have to say that it's immediately obvious that you persue high standards and care a great deal about delivering a quality product.